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Single-event-camera-based 3D trajectory measurement method for high-speed moving targets

Chinese Optics Letters 2022年第6期20卷 14-18页

作者：郜泽仁苏勇张青川 Key Laboratory of Mechanical Behavior and Design of Materials of Chinese Academy of Sciences University of Science and Technology of ChinaHefei 230027China

High-speed target three-dimensional[3D]trajectory and velocity measurement methods have important uses in many fields,including explosive debris and rotating specimen trajectory *** conventional approach uses a binocular system with two high-speed cameras to capture the target’s 3D motion *** cost for the conventional approach is high,and accurately triggering several high-speed cameras is ***-based cameras have recently received considerable attention due to advantages in dynamic range,temporal resolution,and power *** address problems of camera synchronization difficulties,data redundancy,and motion blur in high-speed target 3D trajectory measurement,this Letter proposes a 3D trajectory measurement method based on a single-event camera and a four-mirror *** 3D trajectory and velocity of a particle flight process and a marker on a rotating disc were measured with the proposed method,and the results show that the proposed method can monitor the operational state of high-speed flying and rotating objects at a very low hardware cost.

关键词： event camera 3D trajectory experimental mechanics

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experimental study of sand grains behavior at their contacts with force-and displacement-controlled sliding tests

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Underground Space 2017年第1期2卷 38-44页

作者： K.Senetakis C.S.Sandeep City University of Hong Kong Hong Kong

Discrete element modeling requires the proper quantification of the behavior of grains at their contacts including the normal force-displacement and tangential force-displacement relationships to be used as input for contact modeling *** paper reports on recent advances in soil mechanics experimentation which allowed measuring the grain contact behavior of small sand particles quantifying friction and stiffness with sliding tests of a force-controlled or displacement-controlled *** particular focus of this work is on the micromechanical behavior of quartz type grains of size between about 1 and 5 mm.A description of the developed micromechanical apparatus at City University of Hong Kong is first discussed and its important different capabilities with previously developed apparatus is briefly ***,a limited set of new data is reported and discussed along with a review of recently acquired results published in the literature associated with the contact behavior of quartz sand *** sliding tests have covered a wider range of normal contact forces from about 0.5 to 8 N,and the results indicated that,for this range of confining forces,there is not any notable change of the inter-particle coefficient of friction.

关键词： Micro-mechanics Inter-particle friction Inter-particle stiffness LBS grains experimental mechanics

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NANO SCIENCE AND ENGINEERING IN SOLID mechanics

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Acta Mechanica Solida Sinica 2008年第2期21卷 95-103页

作者： Ken P.Chong Engineering Advisor and Director of Mechanics ＆ Materials National Science FoundationArlington VA 22230 U.S.A.

According to National Science Foundation （NSF） Director A. Bement, ‘Transformative research is... research driven by ideas that stand a reasonable chance of radically changing our understanding of an important existing scientific concept or leading to the creation of a new paradigm or field of science is also characterized by its challenge to current understanding or its pathway to new frontiers.＇ Nanotechnology is one of such frontiers. It is the creation of new materials, devices and systems at the molecular level--phenomena associated with atomic and molecular interactions strongly influence macroscopic material properties with significantly improved mechanical, optical, chemical, electrical... properties. Former NSF Director Rita Colwell in 2002 declared, ‘nanoscale technology will have an impact equal to the Industrial Revolution＇. The transcendent technologies include nanotechnology, microelectronics, information technology and biotechnology as well as the enabling and supporting mechanical and civil infrastructure systems and materials. These technologies are the primary drivers of the twenty first century and the new economy. mechanics is an essential eleraent in all of the transcendent technologies. Research opportunities, education and challenges in mechanics, including experimental, numerical and analytical methods in nanomechanics, carbon nano-tubes, bio-inspired materials, fuel cells, as well as improved engineering and design of materials are presented and discussed in this paper.

关键词： nanomechanics experimental mechanics multi-scales simulation and modeling carbon nanotubes energy, bio-inspired materials

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